EP0756409B1 - Störungsklingelunterdrückungsvorrichtung, insbesondere für Zusatzklingeln in Stecktelephonsystemen - Google Patents

Störungsklingelunterdrückungsvorrichtung, insbesondere für Zusatzklingeln in Stecktelephonsystemen Download PDF

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Publication number
EP0756409B1
EP0756409B1 EP95830338A EP95830338A EP0756409B1 EP 0756409 B1 EP0756409 B1 EP 0756409B1 EP 95830338 A EP95830338 A EP 95830338A EP 95830338 A EP95830338 A EP 95830338A EP 0756409 B1 EP0756409 B1 EP 0756409B1
Authority
EP
European Patent Office
Prior art keywords
auxiliary
telephone
ringer
terminal
mos
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95830338A
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English (en)
French (fr)
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EP0756409A1 (de
Inventor
Pietro Consiglio
Carlo Antonini
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STMicroelectronics SRL
Original Assignee
STMicroelectronics SRL
SGS Thomson Microelectronics SRL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by STMicroelectronics SRL, SGS Thomson Microelectronics SRL filed Critical STMicroelectronics SRL
Priority to DE69532885T priority Critical patent/DE69532885D1/de
Priority to EP95830338A priority patent/EP0756409B1/de
Priority to US08/684,175 priority patent/US5818923A/en
Publication of EP0756409A1 publication Critical patent/EP0756409A1/de
Application granted granted Critical
Publication of EP0756409B1 publication Critical patent/EP0756409B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H04M1/74—Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults

Definitions

  • the present invention relates to an acoustic feedback suppression system, particularly for auxiliary ringers in socket telephone systems.
  • auxiliary ringer of the electromechanical type in addition to the conventional ringer present in the telephone set.
  • Said auxiliary ringer is always connected to the telephone line even when the respective telephone sets are not connected to the various sockets and has the purpose of allowing to recognize an incoming telephone call so as to connect a set to the line in order to reply.
  • auxiliary ringer introduces an acoustic feedback if a user dials a telephone number with a pulse dialer on one of the socket telephone sets connected to the telephone line.
  • the interruption frequency is usually 10 Hz, with an open/close ratio of 1.5-2.
  • EP-A-556 742 discloses an acoustic feedback suppression device, particularly for auxiliary ringers in plug-in telephone systems, comprising a first and a second terminals of a telephone line, an internal ringer, and an auxiliary ringer connected between said first and said second telephone lines: the circuit disclosed limits the AC voltage present across the auxiliary ringer.
  • the voltage limiting action must not affect the ordinary call signals when the handset is off-hook and the telephone is being used to communicate with another user.
  • connection by means of an appropriate switch, of a voltage limiter that is constituted by a pair of Zener diodes, mutually connected with their respective anode terminals, and by a connection switch.
  • This solution for eliminating acoustic feedback entails the use of a single Zener diode and of a double bridge.
  • the drawback of the above mentioned solutions resides in the difficulty in integrating the acoustic feedback suppression circuits on a single silicon substrate.
  • the principal aim of the present invention is therefore to provide an acoustic feedback suppression system capable of eliminating acoustic feedback when dialling a telephone number with a pulse dialer.
  • an object of the present invention is to provide an acoustic feedback suppression system capable of limiting the voltage at the terminals of the auxiliary ringer of the telephone line.
  • Another object of the present invention is to provide an acoustic feedback suppression system that is compact and thus easy to integrate.
  • Another object of the present invention is to provide a device that is highly reliable, relatively easy to manufacture; and at competitive costs.
  • an acoustic feedback suppression system particularly for auxiliary ringers in socket telephone systems, comprising a first and a second terminals of a telephone line, an internal ringer, and an auxiliary ringer that is connected between said first and said second telephone lines, characterized in that it comprises first and second switching means adapted to reduce the voltage at the terminals of said auxiliary ringer, call, control and signalling means adapted to generate an activation signal when a user dials a telephone number, and activation means adapted to be controlled by said activation signal and to activate the first and second switching means.
  • Figure 1 is a diagram of an embodiment of a known suppression device, wherein the references numerals 70 and 80 designate two Zener diodes mutually connected by their anodes, the reference numeral 90 designates a DC decoupling capacitor, and the reference numeral 75 designates mechanical switches.
  • Figure 2 is a diagram of a detail of figure 1.
  • FIG. 3 is a diagram of a further solution, which uses a single Zener diode 70 and two rectifier bridges 96 and 97.
  • the bridge 97 has the purpose of ensuring the polarity of the switches 95.
  • figure 4 is a diagram of a system solution, showing the connections between the telephone set 120 and the internal ringer 130, with the limiter circuit 98 and 99 connected in parallel.
  • the first and the second terminals of the telephone line are designated by L1 and L2 respectively.
  • a first diode bridge 1 is connected between the first terminal L1 and the second terminal L2.
  • Control and signalling means 2, activated by a first switch 3, are connected to a second terminal 30 of the bridge 1.
  • a first terminal 4 of the first diode bridge 1 is connected, by means of a second switch 5, to the reference ground of the telephone set (substrate).
  • a second diode bridge known as ringer bridge, is connected to the reference ground with one terminal, and the terminal 7 is connected to the internal ringer 9 of the telephone set by means of a third switch 8.
  • the second bridge 6 is in turn connected to the first telephone line L1 by interposing an impedance resistor 10 and a first capacitor 11 for decoupling the line from the DC direct component (ringer impedance).
  • An auxiliary ringer 50 is parallel-connected between the first telephone line L1 and the second telephone line L2, with the interposition of a second decoupling capacitor 40 (connection provided by the socket system as in figure 4).
  • the output signal of the call, control, and signalling means 2 is adapted to drive a circuit portion comprising activation means, which advantageously comprise a first current source 12 and a second current source 13, both of which are driven by the signal present on the line 14 and originating from the control and signalling means 2.
  • Two mutually symmetrical circuit configurations are arranged in series to the two current sources 12 and 13 and respectively comprise first switching means 15, controlled by the first current source 12, and second switching means 16, controlled by the second current source 13.
  • the first switching means 15 are provided with a first Zener diode 17 and with a first resistor 18 parallel-connected to said diode 17.
  • the second switching means 16 are provided with a second Zener diode 19 and with a second resistor 20 parallel-connected to said diode 19.
  • the first switching means 15 and the second switching means 16 can be provided by means of MOS devices.
  • the first and second resistors have the purpose of keeping the two MOS devices off, since the voltage V GS between the gate and the source is shorted through said two resistors.
  • the first Zener diode 17 and the second Zener diode 19 therefore have the purpose of providing protection for the voltage V GS between the gate and the source of the two MOS devices, preventing damage of the gate terminals of the MOS devices.
  • the first MOS device 15 has a first intrinsic diode 21 and the second MOS device 16 has a second intrinsic diode 22.
  • the source of the first MOS device 15 is connected to a branch 23 (the above mentioned terminal S; hereinafter, reference will be made to the terminal S), which is connected to the line of the auxiliary ringer 50, parallel-connected to L1.
  • the source of the second MOS device 16 is instead connected to the line L2 and to the other terminal of the auxiliary ringer 50.
  • the drain of the first MOS device 15 is connected to the drain of the second MOS device 16.
  • the gate of the first MOS device 15 is connected to the first current source 12 and the gate of the second MOS device 16 is connected to the second current source 13.
  • the MOS devices 15 and 16 are advantageously N-channel MOS devices.
  • control and signalling means 2 are constituted by a so-called call circuit and by a microprocessor adapted to generate an activation command when a telephone number is pulse-dialled by the user.
  • the activation command is thus sent along the branch 14 to activate the current sources 12 and 13.
  • Figure 6 is a diagram of the circuital embodiment of the two current sources, in which mirroring transistors 300 and 400 of the P-channel type are used.
  • the auxiliary ringer 50 is also enabled.
  • the activation signal enables both current sources 12 and 13, but the current source 12 is off and is unable to supply current to the resistor 18 because the source is connected to the maximum voltage (the branch 23, in the specific case), which coincides with the other terminal of the resistor 18, so that the MOS device 15 is off and therefore the intrinsic diode 21 is forward biased and the intrinsic diode 22 is reverse biased.
  • the current then flows in the mirror-symmetrical part of the circuit, the second current source 13 is on, and the current flows in the second resistor 20.
  • the voltage drop across the second resistor 20 causes the second MOS device 16 to conduct. For this to occur, the voltage drop across the second resistor 20, which is determined by multiplying the current by the value of said resistor, must be greater than the voltage V GS between the gate and the source of the second MOS device 16.
  • the activation of the second MOS device 16 causes a reduction in the voltage between the terminal S and the second terminal L2 of the telephone line, where the auxiliary ringer 50 is connected.
  • Said voltage reduction between S and L2 therefore causes the deactivation of the auxiliary ringer and the consequent suppression of the acoustic feedback.
  • the circuit behaves in a mirror-symmetrical manner, so that this time the MOS device 15 is on and the source 13 is off, providing in a similar manner the reduction in voltage between the two terminals S and L2 of the auxiliary ringer 50.
  • the device according to the invention fully achieves the intended aim and objects, since it allows to suppress acoustic feedback, limiting the voltage across the auxiliary ringer when a user dials the desired telephone number with a pulse dialer.
  • the device according to the invention does not affect the telephone line in all other cases, that is to say, when the auxiliary ringer must be active and when the telephone is in the call mode, in which the call, control, and signalling means 2 do not send the activation signal to the two current sources 12 and 13.
  • the materials employed may be any according to the requirements and the state of the art.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Telephonic Communication Services (AREA)

Claims (11)

  1. Akustisches Rückkoppeiungs-Unterdrückungssystem, insbesondere für Hilfsruftongeber in Stecktelefonsystemen, mit einem ersten Anschluss (L1) und einem zweiten Anschluss (L2) einer Telefonleitung, einem internen Ruftongeber (9) und einem Hilfsruftongeber (50), der zwischen den ersten und zweiten Telefonleitungen geschaltet ist, gekennzeichnet durch
       ein erstes Schaltmittel (15) und ein zweites Schaltmittel (16), welche dazu ausgebildet sind, die Spannung an den Anschlüssen des Hilfsruftongebers (50) zu reduzieren,
       Anruf-, Steuerungs- und Signalisierungsmittel (2), die dazu ausgebildet sind, ein Aktivierungssignal (14) zu erzeugen, wenn ein Benutzer eine Telefonnummer wählt,
       und Aktivierungsmittel (12, 13), die dazu ausgebildet sind, vom Aktivierungssignal gesteuert zu werden, um die ersten und zweiten Schaltmittel (15, 16) zu aktivieren.
  2. Vorrichtung nach Anspruch 1,
    dadurch gekennzeichnet, dass die Anruf-, Steuerungs- und Signalisierungsmittel (2) an eine erste Gleichrichterbrücke (1) durch Zwischenschaltung eines Schalters (3) angeschlossen sind.
  3. Vorrichtung nach Anspruch 1,
    dadurch gekennzeichnet, dass die Aktivierungsmittel (12, 13) eine erste Stromquelle (12) und eine zweite Stromquelle (13) aufweisen, die durch das Aktivierungssignal (14) aktiviert werden können, welches von den Steuerungs- und Signalisierungsmitteln (2) stammt.
  4. Vorrichtung nach Anspruch 1,
    dadurch gekennzeichnet, dass die Schaltmittel (15, 16) einen ersten Schalter (15) und einen zweiten Schalter (16) aufweisen.
  5. Vorrichtung nach Anspruch 4,
    dadurch gekennzeichnet, dass die ersten und zweiten Schalter ein erstes MOS-Element (15) und ein zweites MOS-Element (16) aufweisen.
  6. Vorrichtung nach Anspruch 5,
    dadurch gekennzeichnet, dass das erste MOS-Element (15) bzw. das zweite MOS-Element (16) eine erste Intrinsic-Diode (21) bzw. eine zweite Intrinsic-Diode (22) aufweist.
  7. Vorrichtung nach Anspruch 5,
    dadurch gekennzeichnet, dass die ersten und zweiten MOS-Elemente (15, 16) jeweils mit einer Zener-Diode (17, 19) zum Schutz versehen sind, wobei jede der Zener-Dioden (17, 19) mit einem parallel geschalteten Widerstand (18, 20) versehen ist.
  8. Vorrichtung nach Anspruch 5,
    dadurch gekennzeichnet, dass die Gate-Anschlüsse des ersten MOS-Elementes (15) bzw. des zweiten MOS-Elementes (16) an die erste Stromquelle (12) bzw. die zweite Stromquelle (13) angeschlossen sind.
  9. Vorrichtung nach Anspruch 5,
    dadurch gekennzeichnet, dass der Drain-Anschluss des ersten MOS-Elementes (15) an den Drain-Anschluss des zweiten MOS-Elementes (16) angeschlossen ist.
  10. Vorrichtung nach Anspruch 5,
    dadurch gekennzeichnet, dass der Source-Anschluss des ersten MOS-Elementes (15) am ersten Anschluss (L1) der Telefonleitung angeschlossen ist und der Source-Anschluss des zweiten MOS-Elementes (16) am zweiten Anschluss (L2) der Telefonleitung angeschlossen ist.
  11. Vorrichtung nach Anspruch 1,
    dadurch gekennzeichnet, dass die Anruf-, Steuerungs- und Signalisierungsmittel (2) einen Mikroprozessor aufweisen, der dazu ausgebildet ist, das Aktivierungssignal (14) zu erzeugen.
EP95830338A 1995-07-28 1995-07-28 Störungsklingelunterdrückungsvorrichtung, insbesondere für Zusatzklingeln in Stecktelephonsystemen Expired - Lifetime EP0756409B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE69532885T DE69532885D1 (de) 1995-07-28 1995-07-28 Störungsklingelunterdrückungsvorrichtung, insbesondere für Zusatzklingeln in Stecktelephonsystemen
EP95830338A EP0756409B1 (de) 1995-07-28 1995-07-28 Störungsklingelunterdrückungsvorrichtung, insbesondere für Zusatzklingeln in Stecktelephonsystemen
US08/684,175 US5818923A (en) 1995-07-28 1996-07-19 System and method for supressing pulse dialing feedback occurring particularly with auxiliary acoustic ringers in socket telephone systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95830338A EP0756409B1 (de) 1995-07-28 1995-07-28 Störungsklingelunterdrückungsvorrichtung, insbesondere für Zusatzklingeln in Stecktelephonsystemen

Publications (2)

Publication Number Publication Date
EP0756409A1 EP0756409A1 (de) 1997-01-29
EP0756409B1 true EP0756409B1 (de) 2004-04-14

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EP95830338A Expired - Lifetime EP0756409B1 (de) 1995-07-28 1995-07-28 Störungsklingelunterdrückungsvorrichtung, insbesondere für Zusatzklingeln in Stecktelephonsystemen

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US (1) US5818923A (de)
EP (1) EP0756409B1 (de)
DE (1) DE69532885D1 (de)

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Also Published As

Publication number Publication date
DE69532885D1 (de) 2004-05-19
US5818923A (en) 1998-10-06
EP0756409A1 (de) 1997-01-29

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